GB1483282A - Apparatus for protecting the information in a virtual memory system in programmed data processing apparatus - Google Patents

Apparatus for protecting the information in a virtual memory system in programmed data processing apparatus

Info

Publication number
GB1483282A
GB1483282A GB52131/74A GB5213174A GB1483282A GB 1483282 A GB1483282 A GB 1483282A GB 52131/74 A GB52131/74 A GB 52131/74A GB 5213174 A GB5213174 A GB 5213174A GB 1483282 A GB1483282 A GB 1483282A
Authority
GB
United Kingdom
Prior art keywords
segment
ring
procedure
descriptor
bit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB52131/74A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bull SA
Original Assignee
Bull SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bull SA filed Critical Bull SA
Publication of GB1483282A publication Critical patent/GB1483282A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory
    • G06F12/1458—Protection against unauthorised use of memory or access to memory by checking the subject access rights
    • G06F12/1491—Protection against unauthorised use of memory or access to memory by checking the subject access rights in a hierarchical protection system, e.g. privilege levels, memory rings

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Storage Device Security (AREA)
GB52131/74A 1973-11-30 1974-12-02 Apparatus for protecting the information in a virtual memory system in programmed data processing apparatus Expired GB1483282A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7342706A FR2258112A5 (ja) 1973-11-30 1973-11-30

Publications (1)

Publication Number Publication Date
GB1483282A true GB1483282A (en) 1977-08-17

Family

ID=9128514

Family Applications (1)

Application Number Title Priority Date Filing Date
GB52131/74A Expired GB1483282A (en) 1973-11-30 1974-12-02 Apparatus for protecting the information in a virtual memory system in programmed data processing apparatus

Country Status (9)

Country Link
US (1) US4177510A (ja)
JP (1) JPS618459B2 (ja)
BR (1) BR7410047A (ja)
CA (1) CA1055615A (ja)
DE (1) DE2456602C2 (ja)
FR (1) FR2258112A5 (ja)
GB (1) GB1483282A (ja)
IT (1) IT1026694B (ja)
NL (1) NL7415569A (ja)

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US8543511B2 (en) 2002-04-29 2013-09-24 Contentguard Holdings, Inc. System and method for specifying and processing legality expressions
US8660961B2 (en) 2004-11-18 2014-02-25 Contentguard Holdings, Inc. Method, system, and device for license-centric content consumption
US8869293B2 (en) 2001-05-31 2014-10-21 Contentguard Holdings, Inc. Method and apparatus for hierarchical assignment of rights to documents and documents having such rights
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Also Published As

Publication number Publication date
JPS50114934A (ja) 1975-09-09
AU7584074A (en) 1976-06-03
IT1026694B (it) 1978-10-20
CA1055615A (en) 1979-05-29
DE2456602A1 (de) 1975-06-19
NL7415569A (nl) 1975-06-03
BR7410047A (pt) 1976-05-25
DE2456602C2 (de) 1985-11-14
US4177510A (en) 1979-12-04
FR2258112A5 (ja) 1975-08-08
JPS618459B2 (ja) 1986-03-14

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Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19941201